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newcommand.CommandText ="insert into OPENDATASOURCE('Microsoft.Jet.OLEDB.4.0', 'Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\db\CjTeach.mdb;Persist Security Info=False')... 表1 select * FROM OPENDATASOURCE('Microsoft.Jet.OLEDB.4.0', 'Provider=Microsoft.Jet.OLEDB.4.0;Data Source= " + oldconnectionString + ";Persist Security Info=False')... 表2"